Really it’s the internet that enables these monopolies. It nullifies space for information. Like a little pizza place can only have so much reach. But if the product is teleported, then that little pizza operation can just keep growing and growing smoothly and taking more of the market. And it can happen really fast.
Why not create a logistics company to compete with amazon? It’s not the outsourcing of logistics that’s the problem — it’s outsourcing it to Amazon specifically because of their specific culture and nature as a company.